海洋古温标研究新进展及其在冲绳海槽区的应用

表层海水古温度的重建是古海洋学研究的重要内容之一,其反演的表层洋流的演化对全球气候变化研究意义重大。近年来,3种新兴的地球化学温度指标(Mg/Ca、U37k'和TEX86)应用十分广泛,但也是各有利弊。在冲绳海槽地区,不同古温标的应用结果差异较大,机理有待进一步探讨。从全球角度总结了3种古温标的适用性及优缺点,剖析了具体应用过程中不同古温标的区域性和时间性差异。重点综述了冲绳海槽区古温标研究历史和研究现状,强调了区域性古温标适用性研究的重要性,提出了该区域末次冰消期以来古温度演化机理研究面临的挑战。

PROGRESS OF MARINE PALEO-TEMPERATURE PROXIES AND THEIR APPLICATION IN THE OKINAWA TROUGH

Paleo-temperature reconstruction is one of the most important components in paleoceanographical studies. The evolution of surface currents driven by paleo-temperature plays an important role in global climate change. In recent years, three newly geochemical proxies (Mg/Ca, Uk'37 and TEX86) have been widely accepted despite some defects. In the Okinawa Trough, there are obvious discrepancies among the results using different paleo-temperature proxies and the mechanism is unknown. In this paper, we summarized the applicability, merits and faults of the above three paleo-temperature proxies from a global perspective, and analyzed their temporal and spatial differences of the results. Emphases are put on the research history and status in quo of Mg/Ca, Uk'37 and TEX86 in the Okinawa Trough, the importance of regional applicability of these paleo-temperature proxies, and the future challenge of paleo-temperature evolution mechanism studies since the last deglaciation in the Okinawa Trough.